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[AVIATION]. LANGLEY, Samuel Pierpont and Charles M. MANLY. Langley Memoir on Mechanical Flight [from: Smithsonian Contributions to Knowledge, Volume 27, Number 3]. Washington D.C.: The Smithsonian Institution, 1911. Large 4to. 101 plates from photographs, drawings, etc. (some double–page). Later gilt–lettered green cloth. FIRST EDITION of this important monograph on Langley’s groundbreaking experiments with flight.